I have a Saunier Duval sd623 combi boiler, approx. 12 years old. For the last 6 months I have only been able to get hot water from the bath taps. The hot taps for the sinks in the bathroom and the kitchen do not produce hot water. For some reason they do not fire up the boiler, it remains with the pilot light on.
When I turn the bath hot tap on and then the kitchen sink hot tap on I only get a trickle of water from the kitchen tap (I use to get more than a trickle with two hot taps on). If I then turn the bath tap off the water comes through fine and hot from the kitchen sink tap and the boiler remains fired up. As soon as I turn off the kitchen tap the boiler goes back to its pilot light state and won't fire up again without the bath tap been opened first.
The central heating appears to be working OK, in that the boiler fires up when required to do so and all the radiators are hot.
The water board did replace the water mains to my block of flats about the time it all started going wrong but I don't know if this is a coincidence.
When I turn the bath hot tap on and then the kitchen sink hot tap on I only get a trickle of water from the kitchen tap (I use to get more than a trickle with two hot taps on). If I then turn the bath tap off the water comes through fine and hot from the kitchen sink tap and the boiler remains fired up. As soon as I turn off the kitchen tap the boiler goes back to its pilot light state and won't fire up again without the bath tap been opened first.
The central heating appears to be working OK, in that the boiler fires up when required to do so and all the radiators are hot.
The water board did replace the water mains to my block of flats about the time it all started going wrong but I don't know if this is a coincidence.